secure perimeter
Protected outer edge
A secure perimeter is a protected boundary around a space—physical or digital—that prevents unauthorized entry.
In military and security contexts, it's the defended outer edge of a base or facility: They established a secure perimeter around the crash site.
In computing, it refers to network defenses that separate trusted internal systems from external threats.
The phrase often appears in action movies and police procedurals when characters need to lock down an area.
- fenceBoundary structure between properties
- barrierObstruction preventing passage
- chain linkConnected metal loop
- guardWatchful defensive attention
- patrolRegular surveillance route
boundary · outer ring · checkpoint · controlled access · surveillance · locked · fortified · watchtower · breach · intrusion · razor wire · motion sensor · alarm · containment · safe zone · restricted · keep out · clearance
- Safety Tipsstay alert, lock it up, see something say something, buddy system, well-lit areas
- securityalarm system, lock, safe, alarm, camera
- diplomacyembassy, ambassador, ambassadors, treaty, treaties
- Quarantine Facilitieslazaretto, pesthouse, quarantine station, quarantine ward, quarantine camp
- restricted zonesexclusion zone, restricted area, no-go zone, quarantine zone, hot zone
secure perimeteropen space
Unobstructed outdoor area
open access · free passage · public space · open borders · open ground
secure, perimeter, security, securely, insecure, insecurity, securities, securing, secured